Table 1 Oligonucleotide primers used for PCR amplifications in this study

V1^a

-

ATGGATCAGAAGAATAAGCTTTC

dkr

V2^b

Spe I

TCTACGACTAGT TCAGTTCAGATCATTCGG

dkr

V3^b

Xho I

CTATCGCTCGAG TCAGTTCAGATCATTCGGG

dkr

P1^a

Spe I

CGGAAATCACGGGAACTAGT CGCCAAA

P _sppA , P _sppQ

P2^b

-

CGGTACCTACAACAGACATGGGAATCATACTCCTATATATTATT

P _sppA

P3^b

-

CGGTACCCACAACAGACATATATGCTGGCCAGCTAAGTA

P _sppQ